Saw-clamping device.



K. J. G. DAHL.

SAW GLAMPING DEVICE.

APPLICATION IILBD 1111.23, 1911.

1,003,99 1 I Patented Sept. 26, 1911.

J L' J COLUMBIA- PLANOGIAP'N CD-, WASHINGTON, D C.

KARL J. G. DAHL, OF MINNEAPOLIS, MINNESOTA.

SAW-CLAMPING DEVICE.

Specification of Letters Patent.

Application filed January 23, 1 911.

Patented Sept. 26, 1911.

Serial No. 604,101.

To all whom it may concern:

Be it known that I, KARL J. G. DAHL, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Saw- Clamping Devices; and I do hereby declare the following to be a full, clear, and exact a description of the invention, such as will e11- views.

Referring to the drawings: Figure 1 is a plan View with some parts broken away showing the improved device; Fig. 2 is a side elevation of the device showing also a portion of a saw blade held thereby; Fig. 3 is an enlarged vertical section taken on the line m :c of Fig. 2, and showing the device secured to a bench; and Fig. 4 is a view in plan with parts broken away, illustrating a slightly modified form of the device.

The saw clamping device comprises two main elements or members, 1 and 2. The member 1 is a relatively fixed or main body member shown as T-shaped in cross section,

and provided with a flat and straight front clamping face, against which the saw blade or is adapted to be clamped by the relatively movable bar 2. The body member 1 is adapted to be secured to a bench or other suitable support by means of screws, clamps or any other suitable devices. At its ends the body member or main clamping bar 1 is provided with abutments preferably in the form of inverted U-shaped arms 3, rigidly secured at one end by rivets to the horizontal flange of the said bar 1.

The clamping bar 2 is preferably constructed from spring steel and at its ends it is provided with heads shown as formed by the looped portions 4 of metal strips 5, which at their ends are riveted to the said bar 2. These strips 5 stifi'en the end portions of the bar 2, but leave the centr por tion thereof resilient. The heads 4 engage with and are held in position by notched seats 6, formed in the ends of the abutments 3. One of the seats 6, to-wit, the left hand seat as shown in Fig. 1, is inclined in respect to the face of the bar 1, so that it has a camming action on the coiipcrating head 4, tending to force the bar 2 against the bar 1. The abutments 3 at the other end of the bar 1 is provided with a presser device for action on the cooperating head 4, with a force tending to press the bar 2 against the bar 1.

g In Figs. 1, 2 and 3 this clamping device is shown as in the form of a thumb screw 7, having threaded engagement with the cooperating abutment, while in Fig. 4, the said clamping device is in the form of an eccentric 8 pivoted to the said frame, but operating on the said cooperating head 4. The clamping screw is preferred because it has a Wider range of adjustment.

lVhen the saw blade a isplaced between the clamping bars 1 and 2, as shown in Fig. 2, and the screw 7 or theeccentric is forced against the adjacent head 4, the saw blade will be tightly clamped between the opposing faces of the two bars, 1 and 2. Not only are the end portions of the bar 2 tightly forced against the saw blade, but the intermediate portion of the said bar 2 is also pressed tightly against the saw blade so that the saw blade will be clamped between the two bars at an approximately uniform pressure throughout its engaged portion. The pressure of the intermediate portion of the bar 2 against the saw blade is due to the fact that the endwise pressure applied to the heads 4 is laterally outward of the line of the blade 2, which produces the inward buckling pressure on the flexible central portion of the bar 2. The curved or U-shaped abutments 3 extend high above the up or edges of the clamping bars, 1 and 2, so tliat the saw clamping or holding device may be applied to a saw blade that is very much longer than the bars 1 and 2.

The device described is of comparatively small cost, is simple to operate, and in actual practice has been found highly eflicient for the purposes had in view.

What I claim is:

1. A saw clamping device comprising a relatively fixed and a relatively movable clamping bar, the former of which is provided at its ends with abutments, and the latter of which is provided at its ends with heads cooperating with seats in said abutments, one of said abutments having a presser device for action on the adjacent head of said movable clamping bar for imparting endwise and lateral movements thereto toward said fixed clamping bar, and the other of said abutments and adjacent head having cam acting surfaces tending to move said movable clamping bar toward said fixed clamping bar under the action of the presser device,substantially as described.

2A saw clamping device comprising a relatively fixed and a relatively movable clamping bar, the former of which is provided at its ends with abutments, and the latter of which is resilient at its central portion and provided at its ends With heads cooperating with seats in said abutments, one of said abutments having a presser device for action on the adjacent head of said movable clamping bar for imparting endwise and lateral movements thereto toward said fixed clamping bar, and the other of said abutments and adjacent head having cam acting surfaces tending to move said movable clamping bar toward said fixed clamping bar under the action of the presser device, substantially as described.

3. In a saw clamping device, the combination with a main clamping bar having U- shaped abutments at its ends, of a movable clamping bar that is resilient at its central portion, and is provided with laterally offset heads at its ends, cooperating with seats in the said abutments, one of said abutments movable clamping bar having a resilient I central portion, and provided at its ends with metal strips secured thereto and bent to form laterally off-set heads, the said abutments having seats for cooperation with the said heads, one of said abutments having a presser device for action on the adjacent head of said movable clamping bar for imparting endwise and lateral movements thereto toward said fixed clamping bar, and

the other of said abutments and adjacent I head having cam acting surfaces tending to move said movable clamping bar toward said fixed clamping bar under the action of the presser device, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

KARL J. G. DAHLV WVitnesses:

HARRY D. KILGORE, Amen V. 'SwANsoN.

Gonies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents.

= Washington, D. C. 

